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MARTIN HUNKLEY, OF ROCHESTER, NEW YORK, ASSIGNOR TO HIM- SELF YAND M. R. BALLINTINE.

Letters Pcflzmt No. 68,301, dated August 2T, 1867.

IMPROVED POWER-HAMMER...

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TO ALL WHOM IT CONCERN:

Be it known that I, MARTIN IIUNKLEY, of Rochester, in the county of Monroe, and State of lNew York, have invented certain new and useful Improvements in the Construction of Blacksmiths Helper-g and I do hereby declare that the following is a full, clear, and exact description thereof', reference being had to the accompanying drawings', making part of this specification, in which- Figure 1 is a side elevation of my invention.

Figure 2 is a plan or top view of the same.

Similar letters of reference indicate corresponding parts in bothigures.

The nature of this invention will be better understood by reference to the drawings and specification.

To enable others to make and use my invention, I will describe its construction and operation. I

Thejack-frame A supports the hammer II and its fixtures, and the foot of each leg is provided with a hook, h, to hook into a staple driven in the floor, in such relative position to the anvil-block as to cause the hammer to properly 'operate upon the metal to be wrought. The hammerbar B has a square eye, which is nicely fitted to the square shaft S, and it is provided with a pointed set-screw s, which screws into the indentures i, made in the shaft S. By this means the hammer may be made to strike upon any desired point longitudinally of the anvil. Instead of the screw s, there might be substituted a spring, rigidly attached to the hammer-bar, and provided with a spur or pin, to reach through into the indentures. The hammer is raised by a sort of convolute spring, C, which is connected to the hammer-shaft by a short lever, I), and threaded connecting-mdf, having a swivelled coupling, c. The treadlc D, by which the operator produces the blow or downward stroke of the hammer, is firmly hinged to the side of the frame, as seen at E, and is connected to the hammer-shaft by the lever d, connecting-rod g, and screw-coupling e, 'similar to the connections for the spring. The hinge-plate w, which is bolted to the treadle, is provirledwith a'hook, o, fig. 2, which clutches the edge of the circular guide-plate n, thereby preventing any lateral vibration of the treadle D. The adjustable plate pVtg. 1, is slotted to receive the clamping bolts, and is provided with a projecting lug or stop, r, against which the hingeplate w of the treadle strikes, and limits the upward stroke or throw of the hammer. By means of the slots in the platep it may be raised or lowered, and thereby regulate the length of stroke ofthe hammer.

The tension of the spring C may be regulated by the swivel screw-coupling c, and by means of the screwcoupling e the tresdle is regulated so as not to strike the floor, and thereby prevent the hammer from reaching the article which is to be wrought.

What I claim as my invention, and desire to secure by Letters Patent, 1s

I. The set-screws, and adjustable hammer-bar B, in combination with the straight indented hammer-shaft S, all constructed and arranged as and for the purposes set forth.

2. In connection with the hammer-shaft S, the 'arrangement herein described of the convolute spring C, screw-couplng e, connecting-mdf, and lever 6, as and for the purposes specified..

3.' The arrangement of the adjustable stop r and guide-plate n, in connection with the coupling-plate w, as and for the purposes specified.

' MARTIN HUN KLEY.

Witnesses:

WM. S. LoUGHBoRoUeH, FRED. A. HATCH. 

